JP2013089470A - Method for manufacturing nonaqueous electrolyte battery, and nonaqueous electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a nonaqueous electrolyte battery capable of preventing a short circuit with higher reliability than conventional nonaqueous electrolyte batteries.SOLUTION: A method for manufacturing a nonaqueous electrolyte battery 100 comprises: a step α of making a positive electrode body including a positive electrode active material layer 12; a step β of forming a first solid layer 31 to constitute a portion of a solid electrolyte (SE) layer 3 by arranging a powder of an amorphous solid electrolyte on the positive electrode body and pressing the powder with a mold heated to temperatures higher than the glass-transition temperature and lower than the crystallization temperature of the solid electrolyte; and a step γ of forming the SE layer 3 composed of the first solid layer 31 and a second solid layer 32 by forming the second solid layer 32 composed of a solid electrolyte on the first solid layer 31 by a gas phase method.

Description

  The present invention relates to a non-aqueous electrolyte battery including a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer interposed between these active material layers. In particular, the present invention relates to a non-aqueous electrolyte battery that is unlikely to cause a short circuit even when repeatedly charged and discharged.

  A nonaqueous electrolyte battery including a positive electrode layer, a negative electrode layer, and an electrolyte layer disposed between these electrode layers is used as a power source on the premise that charging and discharging are repeated. The electrode layer included in the battery further includes a current collector having a current collecting function and an active material layer containing an active material. Among such non-aqueous electrolyte batteries, in particular, a non-aqueous electrolyte battery that charges and discharges by movement of Li ions between the positive and negative electrode bodies has a high discharge capacity while being small.

  In the non-aqueous electrolyte battery described above, it has been proposed to make the electrolyte layer solid in order to suppress a short circuit between the positive electrode and the negative electrode caused by dendrites. The dendrite is a needle-like Li crystal generated on the surface of the negative electrode active material layer as the battery is charged and discharged. As a technique for more effectively suppressing the dendrite growth, for example, Patent Document 1 discloses a technique in which the solid electrolyte layer is further formed into a two-layer structure of a powder molded body portion and a surface vapor deposition film. The powder molded body portion obtained by pressure-molding the solid electrolyte powder has a drawback that voids that become dendrite growth paths are easily formed inside. However, since the powder molded body portion is difficult to break, there is an advantage that a new dendrite growth path due to cracking is hardly formed. On the other hand, the vapor-deposited surface-deposited film has the advantage of having almost no voids as a dendrite growth path because it is dense. There is a drawback that there is a possibility. In the non-aqueous electrolyte battery of Patent Document 1 provided with these powder molded body part and surface deposited film, the disadvantages of the powder molded body part are covered with the advantages of the surface deposited film, and the defects of the surface deposited film are covered with the advantages of the powder molded body part. By covering with, dendrite growth is suppressed.

JP 2009-301959 A

  In the technique of Patent Document 1, dendrite growth may not be sufficiently suppressed. This is because when the surface vapor-deposited film is formed on the powder molded body, if the surface of the powder molded body is too rough, defects on the surface may not be filled with the surface vapor-deposited film. Further, if the surface of the powder molded body is rough, the surface vapor deposition film may grow abnormally, and defects such as pinholes may occur in the surface vapor deposition film. If it becomes so, it will become impossible to make up for the fault of a powder fabrication object part with a surface vapor deposition film, and the effect which controls a short circuit will also decrease. Furthermore, when the surface of the powder molded body portion is rough and the surface of the surface vapor deposition film formed on the surface becomes rough, the solid electrolyte layer composed of the powder molded body portion and the surface vapor deposition film, and the negative electrode active material layer There may be a gap between them. The gap is likely to become a dendrite growth starting point causing a short circuit.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide a method for producing a non-aqueous electrolyte battery capable of producing a non-aqueous electrolyte battery that can prevent a short circuit more reliably than in the past. There is. Another object of the present invention is to provide a nonaqueous electrolyte battery obtained by the method for producing a nonaqueous electrolyte battery of the present invention.

  As a result of intensive studies of the above problems by the present inventors, it has been found that the solid electrolyte particles constituting the solid electrolyte powder are crystalline, which is the cause of the rough surface of the powder molded body. This is because crystalline solid electrolyte particles are difficult to be plastically deformed, and the particle size and shape of each particle are easily reflected on the surface. Based on this knowledge, the present inventors used an amorphous solid electrolyte powder excellent in plastic deformability in forming the solid electrolyte layer, and heat-treated in a specific range of temperature conditions when the powder is pressed. Propose to apply.

(1) A method for producing a nonaqueous electrolyte battery of the present invention is a nonaqueous electrolyte for producing a nonaqueous electrolyte battery comprising a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between these active material layers. A method for producing an electrolyte battery, comprising the following steps α to γ.
[Step α] A positive electrode body having a positive electrode active material layer is prepared.
[Step β] ... An amorphous solid electrolyte powder is placed on the positive electrode body, and the powder is pressure-molded with a mold heated above the crystallization temperature above the glass transition temperature of the solid electrolyte, A first solid layer that becomes a part of the solid electrolyte layer is formed.
[Step γ]... A solid electrolyte layer composed of the first solid layer and the second solid layer is formed on the first solid layer by forming a second solid layer composed of the solid electrolyte by a vapor phase method. .

  According to the said structure, the 1st solid layer with the smooth surface can be formed by press-molding the amorphous solid electrolyte powder excellent in plastic deformability. In addition, by heating the mold that pressurizes the powder during the pressure molding to a temperature above the glass transition temperature and below the crystallization temperature, the powder becomes supercooled (melt state), so that the plasticity of the powder Combined with the deformation, the surface of the first solid layer is smoothly finished (maximum height Rz (JIS B0601); around 0.2 to 0.35 μm). If the second solid layer is formed on the first solid layer having a smooth surface, the second solid layer having a smooth surface with almost no defects such as pinholes can be formed (Rz; 1 μm or less). As a result, it can be set as a nonaqueous electrolyte battery provided with the solid electrolyte layer which can prevent a short circuit effectively.

  Even if the entire solid electrolyte layer is formed by a vapor phase method, it is difficult to make the surface of the solid electrolyte layer smoother than the surface of the second solid layer of the present invention. This is because when the solid electrolyte layer is thickened by the vapor phase method, the surface of the solid electrolyte layer tends to become rough due to splash or abnormal growth. Specifically, if a solid electrolyte layer having a thickness necessary for a nonaqueous electrolyte battery is formed only by a vapor phase method, the limit of Rz on the surface is about 0.5 μm.

(2) As one form of the manufacturing method of this invention nonaqueous electrolyte battery, it is preferable that the time which press-molds powder is 1 to 12 hours.

  The time for pressing, that is, the time for performing the heat treatment, is an important requirement for bringing the powder into a supercooled state. By setting the pressurization time to 1 hour or longer, the solid electrolyte powder can be sufficiently supercooled over the entire surface of the first solid layer, and the surface of the first solid layer can be made smooth. Moreover, it can suppress that the productivity of a battery falls by making pressurization time into 12 hours or less. In consideration of further improving the productivity of the battery, the pressing time is preferably 4 hours or less.

(3) As one form of the manufacturing method of this invention nonaqueous electrolyte battery, it is preferable that the pressure at the time of pressure-molding powder is 360 Mpa or more.

  By setting the pressure of the pressurization to 360 MPa or more, the gap between the particles can be reduced, and the first solid layer with few defects can be formed.

(4) As one form of the manufacturing method of the nonaqueous electrolyte battery of the present invention, the solid electrolyte constituting the first solid layer and the second solid layer are both sulfides containing Li ₂ S—P ₂ S _5. preferable.

  Since the sulfide has high Li ion conductivity and low electron conductivity, it is suitable as a solid electrolyte constituting the solid electrolyte layer. Further, since the sulfide solid electrolyte is relatively soft and excellent in plastic deformability, when the first solid layer is formed by pressure molding, voids or the like are unlikely to occur in the first solid layer.

(5) On the other hand, the nonaqueous electrolyte battery of the present invention includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between these active material layers. It was obtained by the manufacturing method of a nonaqueous electrolyte battery.

  According to the said structure, since there are almost no space | gap and defect which can become a dendrite growth path | route in a solid electrolyte layer, it can be set as a nonaqueous electrolyte battery which is hard to be short-circuited even if charging / discharging is repeated.

  According to the configuration of the nonaqueous electrolyte battery of the present invention, it is possible to obtain a battery in which a short circuit hardly occurs even when charging and discharging are repeated.

It is a schematic sectional drawing of the nonaqueous electrolyte battery of this invention which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Overall configuration of nonaqueous electrolyte battery>
A nonaqueous electrolyte battery 100 shown in FIG. 1 includes a positive electrode layer 1, a solid electrolyte layer (SE layer) 3, and a negative electrode layer 2. The positive electrode layer 1 further includes a positive electrode current collector 11 and a positive electrode active material layer 12, and the negative electrode layer 2 further includes a negative electrode current collector 21 and a negative electrode active material layer 22. The SE layer 3 further includes a first solid layer 31 formed by powder molding and a second solid layer 32 formed by a vapor phase method. Such a battery 100 can be manufactured by the manufacturing method of the nonaqueous electrolyte battery shown below.

<Method for producing non-aqueous electrolyte battery>
The manufacturing method of a nonaqueous electrolyte battery includes the following steps.
(A) A positive electrode body (positive electrode layer 1) having a positive electrode active material layer 12 is produced.
(B) The first solid layer 31 is formed on the positive electrode body by press-molding amorphous solid electrolyte powder.
(C) The second solid layer 32 is formed on the first solid layer 31 by a vapor phase method.
(D) The negative electrode layer 2 is formed on the second solid layer 32.
* As will be described later, Step A and Step B can be performed simultaneously.

<< Step A: Preparation of positive electrode layer >>
The production of the positive electrode body may be performed prior to the formation of the first solid layer 31 in [1] Step B, or [2] may be performed simultaneously with Step B described later. In the section of step A, the above [1] will be described, and the above [2] will be described in the item of step B described later.

  The positive electrode body may be composed of only the positive electrode active material layer 12, or may be composed of the positive electrode current collector 11 and the positive electrode active material layer 12. When a positive electrode body having only the positive electrode active material layer 12 is produced, the raw material powder (positive electrode active material powder + solid electrolyte powder as required) may be pressure-molded. In this case, the positive electrode current collector 11 may be provided on the positive electrode body at an arbitrary timing such as after the process B or the process C.

  In order to produce a positive electrode body in which the positive electrode current collector 11 and the positive electrode active material layer 12 are integrated, a substrate to be the positive electrode current collector 11 is first prepared, and then the remaining positive electrode active material is formed on the substrate. The layer 12 may be formed. In this case, the positive electrode active material layer 12 may be produced by pressure forming a raw material powder, or may be produced by a vapor phase method such as a vacuum deposition method or a laser ablation method.

As the positive electrode current collector 11, a conductive material such as Al, Ni, an alloy thereof, or stainless steel can be used. As the positive electrode active material used in the positive electrode active material layer 12, is selected substances having a layered rock-salt crystal structure, for _{example, Liα X β (1-X} ) O 2 (α is Co, Ni, Mn, 1 type, β is a material selected from Fe, Al, Ti, Cr, Zn, Mo, Bi, Co, Ni, Mn, α ≠ β, and X is 0.5 or more). it can. In particular, LiCoO ₂ is preferable for the positive electrode active material. In addition, a positive electrode active material having a spinel crystal structure and a positive electrode active material having an olivine crystal structure can also be used. The positive electrode active material layer 12 may contain electrolyte particles that improve the Li ion conductivity of the layer 12, or may contain a conductive additive or a binder.

<< Step B: Formation of first solid layer >>
In order to form the first solid layer 31, first, an amorphous solid electrolyte powder (aggregate of particles) having an average particle diameter of about 0.5 to 3 μm is prepared. The solid electrolyte powder may be an oxide such as LPON or a sulfide such as Li ₂ S—P ₂ S ₅ . In particular, sulfide is preferable because of its high Li ion conductivity. The sulfide may contain an oxide such as P ₂ O ₅ that has an effect of improving the reduction resistance of the first solid layer 31.

  Next, the positive electrode body produced in step A is placed inside the mold, and the solid electrolyte powder is placed on the positive electrode body. Then, the solid electrolyte powder is pressurized together with the positive electrode body to form the first solid layer 31 on the surface of the positive electrode body. The pressing pressure is preferably 360 to 720 MPa, and the pressing time is preferably 1 to 12 hours.

The pressure molding of the solid electrolyte powder is performed under a temperature condition that is higher than the glass transition temperature of the solid electrolyte and lower than the crystallization temperature. For example, in the case of Li ₂ S—P ₂ S ₅ powder, the glass transition temperature is about 200 ° C., and the crystallization temperature is about 240 ° C., so it is better to perform pressure molding in the range of 210 to 230 ° C. When the amorphous Li ₂ S—P ₂ S ₅ film is formed by the vapor phase method, the cause is unknown, but the crystallization temperature of the film is less than 200 ° C.). By performing pressure molding under such a specific range of temperature conditions, the amorphous solid electrolyte can be brought into a supercooled state (melt state). As a result, the surface of the completed first solid layer 31 (surface opposite to the positive electrode body) can be smoothed. The smoothness of the surface of the first solid layer 31 can be evaluated by, for example, the maximum height Rz (JIS B0601). Specifically, if Rz is 0.35 μm or less, it can be determined that the surface of the first solid layer 31 is smooth. Note that the crystal structure of the first solid layer 31 produced under a temperature condition lower than the crystallization temperature is amorphous.

  As another method for forming the first solid layer 31, the powder used as the raw material of the positive electrode active material layer 12 and the powder used as the raw material of the first solid layer 31 are filled in a mold in layers and are pressed at once. Molding is mentioned. Thereby, the process A and the process B are performed simultaneously, and the positive electrode body provided with the first solid layer 31 is manufactured. In addition, the metal foil used as the positive electrode current collector 11 may be disposed at the bottom of the mold, and the members 11, 12, and 31 may be integrally manufactured at a time.

  The thickness of the first solid layer 31 is preferably 90 to 98% of the total thickness of the SE layer 3. The specific thickness of the first solid layer 31 is preferably 100 to 200 μm.

<< Step C: Production of second solid layer >>
For the formation of the second solid layer 32, for example, a vapor phase method such as a vacuum deposition method, a sputtering method, an ion plating method, or a laser ablation method can be used. Specifically, the positive electrode body on which the first solid layer 31 is formed is placed in a vacuum chamber, the solid electrolyte is evaporated in the vacuum chamber, and the second solid layer 32 is formed on the surface of the first solid layer 31. To do.

  The solid electrolyte constituting the second solid layer 32 may be composed of a different type of solid electrolyte from the first solid layer 31, but may be composed of the same type of solid electrolyte as the first solid layer 31. preferable. If both layers 31 and 32 are made of the same solid electrolyte, it is difficult to cause unevenness in the Li ion conductivity of the SE layer 3.

  The conditions of the vapor phase method are not particularly limited as long as the first solid layer 31 is not crystallized. Specifically, when the vapor phase method is performed, a member to be a substrate (here, the first solid layer 31 formed on the positive electrode body) is heated, and the temperature is a solid electrolyte crystal. Do not exceed the conversion temperature. Under such conditions, the first solid layer 31 is kept in an amorphous state, and the second solid layer 32 formed on the first solid layer 31 is also in an amorphous state. Here, when the solid electrolyte constituting the first solid layer 31 and the second solid layer 32 is common, an interface is not substantially formed between the layers 31 and 32.

  As a condition other than the temperature in the vapor phase method, the impurity concentration in the film formation chamber atmosphere at the time of film formation can be reduced. As the impurity concentration in the film forming atmosphere is lowered, the dense second solid layer 32 can be formed. Therefore, it is preferable that the degree of vacuum in the film formation chamber be 0.002 Pa or less before the start of film formation.

  The thickness of the second solid layer 32 formed on the first solid layer 31 is preferably 2 to 10% of the total thickness of the SE layer 3. The specific thickness of the second solid layer 32 is preferably 5 to 10 μm. By setting the thickness of the second solid layer 32 formed by the vapor phase method to 5 μm or more, the second solid layer 32 having a smaller Rz than the first solid layer 31 can be formed by the smoothing effect of the vapor phase method. it can. Further, by setting the thickness of the second solid layer 32 to 10 μm or less, the possibility of splash and abnormal growth can be suppressed, and the second solid layer 32 having a small Rz can be formed.

<< Step D: Production of Negative Electrode Layer 2 >>
In order to form the negative electrode layer 2, the negative electrode active material layer 22 and the negative electrode current collector 21 may be sequentially stacked on the stacked body including the members 11, 12, 31, and 32. For example, the negative electrode active material layer 22 may be formed on the second solid layer 32 of the laminate by a vapor phase method, and the negative electrode current collector 21 made of a metal foil may be bonded onto the negative electrode active material layer 22. .

As the negative electrode active material used for the negative electrode active material layer 22, an oxide containing Li such as C, Si, Ge, Sn, Al, Li alloy, or Li ₄ Ti ₅ O ₁₂ can be used. The negative electrode active material layer 22 may contain electrolyte particles, a conductive additive, a binder, and the like. Moreover, as the negative electrode current collector 21, a conductive material such as Cu, Ni, Fe, Cr, and alloys thereof (for example, stainless steel) can be suitably used.

≪Effect of nonaqueous electrolyte battery≫
The nonaqueous electrolyte battery 100 obtained through the above-described steps is less likely to cause a short circuit than a battery having a conventional configuration (a battery including a powder molded body portion and a surface-deposited film). That is, when the first solid layer 31 is formed by pressure molding the powder, the surface of the first solid layer 31 can be smoothed by performing heat treatment under a specific range of temperature conditions. This is because defects such as pinholes hardly occur in the second solid layer 32 formed on the first solid layer 31 by a vapor phase method. Further, if the second solid layer 32 is formed on the first solid layer 31 having a smooth surface by a vapor phase method, the surface of the second solid layer 32 is also smoothed. It is considered that the formation of a gap serving as a dendrite growth starting point between the SE layer 3 made of the layer 32 and the negative electrode active material layer 22 is less likely to cause a short circuit in the nonaqueous electrolyte battery 100.

(Example)
Nonaqueous electrolyte batteries 100 (samples 1 to 11) having the configuration of FIG. 1 were actually produced. Each sample is common except that the formation conditions of the SE layer 3 are different. The common parts are as follows.
Positive electrode current collector 11 ... Al plate Positive electrode active material layer 12 ... LiCoO ₂ : Li ₂ S—P ₂ S ₅ : acetylene black: VT470 (Binder for positive electrode manufactured by Daikin Industries, Ltd.) = 44: 48: 2: 6 ( Volume%); thickness 100 μm
Negative electrode current collector 21 ... SUS plate Negative electrode active material layer 22 ... Metal Li; thickness 1.0 µm

On the other hand, the SE layer 3 of each sample was formed as follows. First, a crystalline solid electrolyte powder (Li ₂ S—P ₂ S ₅ ) having an average particle diameter of 5 μm and an amorphous solid electrolyte powder (Li ₂ S—P ₂ S ₅ ) having an average particle diameter of 3 μm were prepared. Then, any one of the prepared solid electrolyte powders was placed on the positive electrode layer 1, and the first solid layer 31 having an average thickness of 100 μm was formed on the positive electrode layer 1 by hot pressing (pressure forming). Table 1 shows the types of powder used in each sample, the hot press pressure (MPa), the press mold temperature (° C.), and the time (h).

A second solid layer 32 having a thickness of about 5 μm was formed on the first solid layer 31 formed under different conditions by a vapor deposition method. The conditions of the vapor deposition method were common to each sample, and the formed second solid layer 32 was amorphous. The conditions of the vapor deposition method are as follows.
Target: Li ₂ S—P ₂ S ₅ pellets Atmospheric pressure: 0.01 Pa

  For each prepared sample, the surface state of the first solid layer 31 when the first solid layer 31 is formed, the surface state of the second solid layer 32 when the second solid layer 32 is formed, and the first solid layer The presence or absence of grain boundaries between the first solid layer 31 and the second solid layer 32 at the time when the second solid layer 32 was formed on the substrate 31 was examined. The surface state was evaluated by measuring the maximum height Rz in any five regions (300 × 300 μm) on the surface of the first solid layer 31 (second solid layer 32) with a laser microscope, and evaluating the average value. The presence or absence of grain boundaries was confirmed visually when the sample was observed by SEM. The results are shown in Table 1.

  As shown in Table 1, samples 5 and 6 were prepared using amorphous solid electrolyte powder and having a pressure molding temperature in the range of more than 200 ° C. (glass transition temperature) and less than 240 ° C. (crystallization temperature). The first solid layer 31 had a smooth surface with Rz of 0.35 μm or less. Therefore, the second solid layer 32 having almost no defects such as pinholes and having Rz of 0.1 μm or less could be formed on the first solid layer 31. Further, no grain boundary was observed between the first solid layer 31 and the second solid layer 32.

  Further, similarly to Samples 5 and 6, the Rz of the first solid layer 31 of Samples 8 to 11 in which the temperature during pressure molding was in the range of more than 200 ° C. and less than 240 ° C. was 0.35 μm or less. Therefore, although not measured, it is expected that the surface of the second solid layer 32 formed on the first solid layer 31 is also smooth (Rz is 0.1 μm or less) as inferred from the results of the samples 5 and 6. Is done.

  On the other hand, since the samples 1 and 2 use crystalline solid electrolyte powder, the shape of the particles constituting the powder is maintained even when heat treatment at 210 ° C. is performed during pressure molding. The surface of 31 was rough (Rz = 0.64 μm, 0.55 μm> 0.35 μm). Further, the surface of the second solid layer 32 was also rough (Rz ≧ 0.5) reflecting the roughness of the surface of the first solid layer 31.

  Samples 3 and 4 use amorphous solid electrolyte powder, but the heat treatment temperature is lower than the glass transition temperature, so the shape of the particles constituting the powder is maintained, and the surface of the first solid layer 31 is rough. (Rz = 0.68 μm, 0.50 μm> 0.35 μm). Further, the surface of the second solid layer 32 was also rough (Rz ≧ 0.43 μm) reflecting the surface roughness of the first solid layer 31.

  Sample 7 uses an amorphous solid electrolyte powder, but since the heat treatment temperature exceeds the crystallization temperature, before the first solid layer 31 becomes flat because the particles constituting the powder are in a molten state. In addition, the particles are crystallized while maintaining the shape of the particles. Therefore, the surface of the first solid layer 31 was rough (Rz = 2.24 μm> 0.35 μm). Moreover, the first solid layer 31 of the sample 7 was cracked. In addition, although Rz of the 2nd solid layer 32 was not measured, if the result of the samples 3 and 4 is considered, it will be expected to greatly exceed 1.0 μm.

  The non-aqueous electrolyte battery produced as described above was charged in a coin cell and subjected to a 30-cycle charge / discharge test under the conditions of a cutoff voltage of 3.0 V to 4.1 V and 0.2 C. The 8-11 nonaqueous electrolyte batteries were able to be charged to the end-of-charge voltage of 4.2 V throughout the entire cycle. On the other hand, all the nonaqueous electrolyte batteries of Samples 1 to 4 and 7 were short-circuited before less than 30 cycles.

  Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the gist of the present invention.

  The non-aqueous electrolyte battery of the present invention can be suitably used as a power source for electric devices based on repeated charge and discharge, for example, a power source for various electronic devices, and can also be expected to be used as a power source for hybrid vehicles and electric vehicles.

DESCRIPTION OF SYMBOLS 100 Nonaqueous electrolyte battery 1 Positive electrode layer 11 Positive electrode collector 12 Positive electrode active material layer 2 Negative electrode layer 21 Negative electrode collector 22 Negative electrode active material layer 3 Solid electrolyte layer (SE layer) 31 First solid layer 32 Second solid layer

Claims (5)

A nonaqueous electrolyte battery manufacturing method for manufacturing a nonaqueous electrolyte battery comprising a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between these active material layers,
Producing a positive electrode body having the positive electrode active material layer;
An amorphous solid electrolyte powder is disposed on the positive electrode body, and the solid electrolyte layer is pressure-molded with a mold heated to a temperature higher than the glass transition temperature of the solid electrolyte and lower than the crystallization temperature. Forming a first solid layer that becomes a part of
Forming a solid electrolyte layer comprising the first solid layer and the second solid layer by forming a second solid layer comprising a solid electrolyte on the first solid layer by a vapor phase method; ,
A method for producing a nonaqueous electrolyte battery, comprising:   The method for producing a nonaqueous electrolyte battery according to claim 1, wherein the pressure molding time is 1 to 12 hours.   The method for producing a nonaqueous electrolyte battery according to claim 1 or 2, wherein the pressure of the pressure molding is 360 MPa or more. 4. The solid electrolyte constituting the first solid layer and the second solid layer is a sulfide containing Li ₂ S—P ₂ S ₅ , according to claim 1. A method for producing a nonaqueous electrolyte battery. A non-aqueous electrolyte battery comprising a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between these active material layers,
The said solid electrolyte layer was obtained by the manufacturing method of the nonaqueous electrolyte battery as described in any one of Claims 1-4, The nonaqueous electrolyte battery characterized by the above-mentioned.

Images